The Central Bank of Sri Lanka (CBSL) issued for circulation, Currency Notes in a series that started in 1991 on theme Sri Lanka Heritage and continued for almost 20 years with small modifications.

• Replaced series of Notes issued from 1987 to 1990.
• The Printer’s name was changed to De La Rue with which Bradbury Wilkinsons had merged.
• Replacement Notes were issued with prefix Z/1, Z/2, Z/3, Z/4, Z/5, Z/6, for denominations Rs 10, Rs 20, Rs 100, Rs 500, Rs 1000 respectively.
  Any replacement note date+denominations that the LakdivaCollection does don’t have, or a specimen has not been reported or shown to me has been put within brackets untill such time as I find a specimen or one is reported to me as their issue has not been fully confirmed.
• The 1991-01-01 missed a dot in a Thamil letter creating a Rare Variety with a mintage of under 1 Million notes.
• The Color of Back of Rs100 Notes was changed from Dark Brown to Orange during issue dated 1992-07-01.
• The Rs 20 dated 1994-08-19 with a mintage of only 6 Million is the most difficult to find in this series.
• With the 1995-11-15 issue the UV printing on the notes were enhanced. Visually the front bottom center design emblem appears blanked.
• With the 2001-12-12 issue the two high denominations Rs500 and Rs1000 got a wider security strip with a curved line monogram along it.
• Dated 2005-11-02 A new Rs2000 denomination was added but was not continued in next series.
• With the 2005-11-15 issue the wider security strip on the two high denominations Rs500 and Rs1000 got Micro Text with CBSL and the Numeric Denomination like the new Rs2000.
• On the Last fixed date of Series 2006-07-03 the Last Rs10 currency note was issued, replaced with a Coin in 2009.
• The next series of Notes dated 2010-01-01 were issued only in 2011 February.